Internal combustion engine



Sept. 12, 1933. w` R, GRlswoLD 1,926,096

INTERNAL COMBUSTION ENGINE Filed March 13, 1931 2 Sheets-Sheet l ML75??R EQJSWULD.

Sept. 12, 1933. w, R. GRlswoLD INTERNAL COMBUSTION ENGINE Filed March15, 1931 2 Sheets-Sheet 2 Patented Sept. 12, 1933 UNITED STATES PATENTori-'ice INTERNAL coMBUs'rIoN ENGINE Application March 13, 1931.

Serial No. 522,377

10 Claims. (c1. 12s-122) haust manifold of the engine to be heated thereby, the thermostatic means being exposed directly to the -exhaust gasesand connected with valve means in the passage of the exhaust gasesthrough theheater.

Another object of the invention is the provision of a therinostaticallycontrolled heater for intake manifolds, wherein the thermostatic meansmay be readily 'adjusted to control or regulate the passage of theheating medium to the heater at preselected temperatures.

With the above and other objects in View thev invention resides in thesundry details of the construction, combination and arrangement oiparts, hereinafter more fully described and pointed out in the appendingclaims.

In the drawings which show the preferred embodiment of the invention asat present devised Figure l isv a side View of the heater;

Figure 2 is a longitudinal sectional vview taken substantially on line2--2 of Figure l;

Figure 3 is an end View ofthe heater as shown in Figurel, and

Figure i is a transverse sectional view taken substantially on line 4 4of Figure 1.

The heater of the present invention is provided by jacketing a portionof the intake manifold M, the jacket forming an enclosing casing aboutthe manifold into which the exhaust gases vfrom the engine are admitted.v

With particular reference to the drawings the intake manifold lVicomprises the normal intake galleries l surrounded at the center portionby a casing 2 spaced therefrom to provide a chamber 3. This chamber 3communicates with the exhaust galleries oi the engine through passages 4in each of which is disposed a butterfly valve 5 caused to be actuatedsimultaneously by a thermostat 6 to open and close the passages 4. Thethermostat 6 is located in the heater chamber 3 and exposed directly tothe exhaust gases admitted into said chamber.

The thermostat 6 comprises a flanged bearing casting 7 having anopeningor bore 8 extending therethrough and piloting in an opening 9 inan 60 end of the casing 2, as shown in Figure 2, said v casting beingsecured in position to the casing by bolts 10 extending through theflange 11.

Secured to the inner end of the casting 7, preferably by welding, is anend of the tube 12, designed to extend substantially longitudinally ofthe chamber 3, while the opposite end of the tube is closed in anysuitable manner, such as by a welded-in plug 13. The tube 12 is of amaterial having a high lineal coefficient of expansion, such as copper,Monel metal, or the like, such as will withstand the high temperatureswithin the chamber 3. Slidabiy disposed in the tube and substantiallycoextensivetherewith is a rod 14 of material of a lower coeilicient oflineal expansion than the tube such as carbon, carborundum, orporcelain. f

A lever 15 is pivotally mounted on the casting 7 so as to oppose thefront end of the bore 8 in said casting. This is preferably accomplishedby bifurcating the front face of thecasting, so as to provide spacedflanges 16 between which an end portionof thelever l5 extends and ispivotaliy mounted on a pin 17 extending through said spaced flanges 16.An adjusting screw 18 is carried by the lever 15, preferably at a pointabove pivot 1'?, but aligned with the bore 8 of the casting so as toextend thereto and bear upon a slidable metallic bearing block 19designed to abut against the adjacent end of the rod 14. Adjustedpositions of the screw 18 may be maintained by a lock nut 20 provided onthe screw. The butterfly valves/5 are connected to the lever 15 by links21 and 22, and a spring 23 connected to lever 15 and to any suitablenxed part normally 95 urges the valves toward closed position and thelever to move and maintain the adjusting screw 18 in an abutting contactwith the bearing block 19,'and the latter against the adjacent end ofthe rod 14 which will react against the closed or plugged end 13 or thethermostat tube 12.

The parts are so adjusted that, at ordinary atmospheric temperatures,the vanes of the butterly valves will assume a position substantiallyparallel to the axes of the passages 4. In this condition, thethermostat tube 12 is in its normally contracted state and the action ofthe spring 23 has caused the parts 18, 19 and 14 to maintain an end toend abutting relation. When the motel' is started the exhaust gases willcirculate through the passages 4 to the chamber 3,

heating the casing 2 and the walls of the intake galleries 1. As theexhaust gases heat the chamber 3, the thermostat tube 12 will expandlength- Wise in varying degrees according to the temperature in thecasing 2.

` Since the rod 14 and the sliding bearing block 19 are of lowercoeflicient of expansion than that ot' the thermostat tube 6, the totallength of the parts 14 and 19 will be less at the higher temperaturesthan the distance from the inner face of the closed end 13 of the tube12 andthe end of the adjusting screw 18 and, by virtue of the forceconstantly exerted on the lever 15 by the spring 23, the parts 14, 18and 19 will be moved toward the closed end of 13 of the tube with itsincreasing length. The resultant movement of the lever is transmittedthrough the links 21 and 22 to close the butterfly Valves 5.

The amount of Vclosing movement of the lever necessary to close thevalves at preselected tem peratures, may be regulated and controlled byan adjustment of the screw 18. On cooling, the reverse action takesplace, that is, the tube 12 contracts lengthwise Aand its closed end 13will react to move the rodV 14, the sliding bearing 19, and the lever 15against the normal tension of the spring 23, whereby the valves 5 arepositively opened. Y

The butterfly valves each comprise the vanes 5 on a valve-shaft 24having one end slidablyextending through a removable bearing 25 screwedinto a wall forming passage 4 and the other end journaled in a bushing26 carried in a removable plate 27 mounted on the opposite wall formingthe passage 4. The outer' end of the shaft 24 has a lever 28 thereonconnected with the link 22. It will be observed, that by removing thebolts 29 securing the cover plates 27 in position, the valves 5 may beexamined and removed.

It will also be observed that due to the construction of the presentdevice the thermostat 6 can be readily removed for cleaning orreplacement by disconnecting the lever 15V and by re- ,moving the bolts10 so that the casting 7 maybe removed from position, withdrawing thethermostat 6 through the'opening 9. By having the thermostat in theIheater chamber 3 it is directly .exposed to the heating gases so that itwill respond more quickly to the heat conditions in the chamber. I e eHaving thus described the invention it will be manifest that a verydurable, dependable, simple and economical device has been provided fora thermostatically controlling intake manifold heater of internalcombustion engines, and, while the inventionis described in -the formwhich is considered to bel the best, it is not limited to such formbecause it is capable of .embodying in other forms; and it is to beunderstood that in and by the claims following the description herein,it is intended to cover the invention in whatever form it may embodywithin the scope thereof.

Having described the invention, what is claimed as new is: Y

1. An intake manifold for internal combustion engines having an intakepassage with an external heating chamber thereabout, said chamber havingan opening in an exterior wall, means connecting said chamber withasource of heat supply, valve means for controlling the passage of theheatingmedium to said chamber, a thermostat disposed in the heatingchamber and insertable and removable throughthe opening in said chamberwall, and a connection between said thermostat and said valve meanswhereby the movement of said thermostat will be transmitted to saidvalve means to open and close the latter, said connection including aspring pressed bearing member maintaining contact connection with saidthermostat.

2`. An intake manifold for internal combustion engines having an intakepassage with a heating chamber -thereabout, means connecting saidchamber with a source of heat supply, valve means for controlling thepassage of the heating medium to said chamber, a thermostat disposed inthe heating chamber, and a connection between said Vthermostat and saidvalve means whereby the movement of said thermostat will be transmittedto said valve means to open and close the latter, said connectionincluding a spring pressed bearing member maintaining contact connectionwith said thermostat, said bearing member being adjustably regulatablewith respect to said thermostat, whereby the closing of the valves maybe effected at predetermined heat temperatures.

3. A heater for intake manifold of internal combustion engines includingan exhaust jacket to extend about said intake manifold and forming aheating chamber, said jacket having a passage for admitting exhaustgases to said chamber and an opening, Valve means in said passage forcontrolling the passage of the heating medium to and from said chamber,a thermostat disposed in the heating chamber and insertable andremovable through the opening in said jacket, a pivoted lever exteriorof jacket and positioned to be operated by the movement of thethermostat,

spring means for normally maintaining an abutting contact between saidlever and thermostat, and an operative connection between said lever andsaid valve means whereby the movement of said thermostat will betransmitted to said valves y Ya pivoted lever exterior of the jacket andhaving a bearing member thereon positioned to contact with saidthermostat, spring means normally maintaining said bearing member incontacting relation with said thermostat, an operative connectionbetween said lever and said valves, whereby the movement of saidthermostat will be transmitted to said Valves to open and close thelatter, said bearing member being adjustable with respect to thethermostat whereby said valves may be closed below predetermined heattemperatures in the chamber.v

5. An intake manifold'heater for internal combustion engines including ajacket extending around said manifold to provide a heat chamber havinginlet and outlet passages connectable to a source of heat supply,pivoted valves to open and close said passages for controlling thepasfsage of the heating medium to the chamber, a

supporting bushing piloting in an opening in said jacket and secured inposition therein and having a boretherethrough, a longitudinallyexpansible and contractible thermostat carried on one endof said bushingand insertable in said opening, an. operable` connection between saidvalves and said thermostat including adjustable means on said connectionto extend in said bore of said bushing and abut with said thermostat,and means for normally maintaining said adjustable means in abuttingrelation with said core.

6. In an intake manifold heater for internal combustion engines having aheat chamber connectable to a source of heat supply, valve means to openand close the chamber to the heating medium, a bushing piloting in anopening in a wall of said chamber and having a bore therethrough, a tubeof high lineal coeiiicient of ex= pansion having one end aligned withsaid bore and lcarried on the inner end of said bushing and an abutmentat the other end of said tube, a core slidable in said tube and of alower coefficient of expansion, an operable connection between saidvalve means and said thermostat including adjustable Contact means onsaid connection to extend in said bore of said bushing and abut withsaid core, and means for normally urging said adjustable Contact meansin abutting relation with said core and said core against the abutmentof said tube.

'1. In an intake manifold heater for internal combustion engines havinga heat chamber conn nectable to a source of heat supply, valve means toopen and close the chamber' to the heating medium, a bushing piloting inan opening in a wall of said chamber and having a bore there through, atube of high lineal coefficient of eX- pansion having one end alignedwith said bore and carried on inner end of said bushing and an abutmentat the other end of said tube, a core slidable in said tube and of alower coeflicient of expansion, a lever pivotally mounted on the outerend of the bushing, a contact member on said lever, a bearing blockslidable in said bore and positioned between said core and contact mem--ber, yielding means normally maintaining said contact member, said blockand core in abutting relation and the core against the closed end ofsaid tube, and a link connection between said lever and said valvemeans.

8. In an intake manifold heater for internal combustion engines a jacketforming a heat chamber, heat control means for said chamber, a

supporting bushing piloting in an opening in said jacket and secured inposition therein and having a bore therethrough, a thermostat carried onone end of the bushing and insertable in said opening in the jacket, alever pivoted on the bushing and exterior of said chamber, a bearingmember on the lever positioned to eX- tend into the bore of said bushingto contact with said thermostat, yielding means acting on said lever formaintaining said bearing member in contact with said thermostat, and anoperative connection between said lever and said heat control means.

9. In an intake manifold heater for internal combustion engines a jacketforming a heat chamber adjacent the manifold, heat control means forsaid chamber, a supporting bushing piloting in an opening in said jacketand secured in position therein and having a bore therethrough, athermostat carried on one end of the bushing and insertable in saidopening in the jacket, a lever pivoted on the bushing and eX- terior ofsaid chamber, a bearing member on the lever positioned to extend intothe bore of said bushing to contact with said thermostat, yielding meansacting on said lever for maintaining said bearing member in contact withsaid thermostat, an operative connection between said lever and saidheat control means, said bearing member on the lever being adjustablethereon relative to said thermostat whereby the heat control means maybe operated at predetermined temperatures.

10. In a manifold having a passage therein and an opening in one wallthereof, a valve insertable in said passage through said opening, saidvalve including a shaft having vanes thereon, a removable bushing in thewall of said passage opposite said opening and through which bushing oneend of the shaft extends, a removable plate for covering the saidopening and having a journal bearing on the inner face thereof in whichthe adjacent end of said shaft is removably journaled, andthermostatically actuated control means attached to an end of the shaft.

W ALTER R. GRISWOLD.

